void round_function(uint8_t *data,uint8_t *rkey,uint8_t mode){
uint8_t i, temp[4];
for(i=0;i<8;i++) data[i] ^= READ_ROUND_KEY_BYTE(rkey[i]);
if(mode==ENC){
S_layer(data)
L_layer(data)
}
else if(mode==DEC){
L_layerInv(data)
S_layer(data)
}
else{//last-enc or first-dec round
S_layer(data)
}
}
void decryption_round_function(uint8_t *data,uint8_t *rkey, uint8_t *temp){
uint8_t i;
for(i=0;i<8;i++) data[i] ^= READ_ROUND_KEY_BYTE(rkey[i]);
L_layerInv(data, temp);
S_layer(data);
}
void Decrypt(uint8_t *block, uint8_t *roundKeys)
{
uint8_t i;
uint8_t temp[4];
for(i=0;i<8;i++) block[i] ^= READ_ROUND_KEY_BYTE(roundKeys[i]);
S_layer(block);
for(i=1;i<NUMBER_OF_ROUNDS;i++) decryption_round_function(block,roundKeys+BLOCK_SIZE*i, temp);
for(i=0;i<BLOCK_SIZE;i++) block[i] ^= READ_ROUND_KEY_BYTE(roundKeys[i])^READ_ROUND_KEY_BYTE(roundKeys[160+i]);
}
void round_functionNoKS(uint8_t *data,uint8_t *rkey,uint8_t mode,uint8_t round){
uint8_t i;
if(mode==LST) S_layer(data);//last-enc or first-dec round
else{
for(i=0;i<4;i++){
data[2*i] ^= READ_ROUND_KEY_BYTE(rkey[2*i]);
if(mode==ENC) data[2*i+1] ^= (READ_ROUND_KEY_BYTE(rkey[2*i+1])+READ_ROUND_CONSTANT_BYTE(round_constants[round*4+i]));
else data[2*i+1] ^= (READ_ROUND_KEY_BYTE(rkey[2*i+1])+READ_ROUND_CONSTANT_BYTE(round_constants[76-round*4+i]));
}
if(mode==ENC){
S_layer(data);
L_layer(data);
}
else if(mode==DEC){
L_layerInv(data);
S_layer(data);
}
}
}
void decryption_round_function(uint8_t *data,uint8_t *rkey,uint8_t round,uint8_t *temp){
uint8_t i;
for(i=0;i<4;i++){
data[2*i] ^= READ_ROUND_KEY_BYTE(rkey[2*i]);
data[2*i+1] ^= (READ_ROUND_KEY_BYTE(rkey[2*i+1])+READ_ROUND_CONSTANT_BYTE(round_constants[76-round*4+i]));
}
L_layerInv(data, temp);
S_layer(data, temp);
}
void Decrypt(uint8_t *block, uint8_t *roundKeys)
{
uint8_t i;
for(i=0;i<BLOCK_SIZE;i++) block[i] ^= READ_ROUND_KEY_BYTE(roundKeys[i]);
S_layer(block);
for(i=0;i<(NUMBER_OF_ROUNDS-1);i++) decryption_round_function(block,roundKeys+BLOCK_SIZE,i);
for(i=0;i<4;i++){
block[2*i] ^= READ_ROUND_KEY_BYTE(roundKeys[2*i])^READ_ROUND_KEY_BYTE(roundKeys[8+2*i]);
block[2*i+1] ^= READ_ROUND_KEY_BYTE(roundKeys[2*i+1])^(READ_ROUND_KEY_BYTE(roundKeys[8+2*i+1])+READ_ROUND_CONSTANT_BYTE(round_constants[i]));
}
}
